Which structure appears as a target-shaped structure posterior to the left thyroid lobe?

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Prepare for the Ultrasound Registry (URR) Exam with focused practice on abdomen topics. Use flashcards and multiple choice questions with hints and explanations. Achieve exam success with comprehensive study materials.

Multiple Choice

Which structure appears as a target-shaped structure posterior to the left thyroid lobe?

Explanation:
On thyroid ultrasound, a target-shaped structure behind the left lobe represents the esophagus. Viewing in transverse, the esophagus cross-section shows concentric wall layers—mucosa and muscularis—creating a bullseye or target appearance. The lumen may distend with swallowing, making this pattern more evident. The trachea sits more anterior and midline with its own ring-like appearance, while the internal jugular vein and common carotid artery have distinct lateral positions and vascular characteristics.

On thyroid ultrasound, a target-shaped structure behind the left lobe represents the esophagus. Viewing in transverse, the esophagus cross-section shows concentric wall layers—mucosa and muscularis—creating a bullseye or target appearance. The lumen may distend with swallowing, making this pattern more evident. The trachea sits more anterior and midline with its own ring-like appearance, while the internal jugular vein and common carotid artery have distinct lateral positions and vascular characteristics.

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